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Reverse IP Domain Checker tool can be used to find for domain names hosted on the same IP address (same shared server). This is common since most people use shared hosting which is very affordable (cheap because every dedicated ip address starts about $2 per month fee) because all websites share the same dedicated server with one IP address. Just enter a domain name or an IP address to get a list of domain names that share the same IP address.
Reverse IP Lookup tool will return a list of gTLD and ccTLD domains added to the subject IP address after our earliest record update for that IP address. Results may not reflect all domains added to the subject IP address.
Almost all popular search engines (Google, Yahoo, Bing, Yandex etc.) increase a web site's rank based on the number of links pointing towards the web site. In an attempt to falsely inflate a web site's popularity, an individual may generate hundreds or even thousands of dummy web sites containing little to no content except for links pointing towards a specific domain name. One method that search engines use to detect this type of miscreant behavior is to see if these inter-linking web sites are hosted on the same IP address or IP address range. If the web sites are in the same IP address range, it is highly likely that they are operated by the same individual. Search engines devalue links from web sites pointing to other web sites hosted on the same IP address range.
Conversely, search engines value links from web sites hosted on different IP addresses. An effective search engine optimizer would go further than hosting inter-linking web sites on different IP addresses. They would host the web sites on completely different class C network addresses. They would make sure that all of their domains were registered with different registrars under different names. They would not use the same template on more than one web site. They would erase all traces that their sites are operated by the same individual. They would go through all of this trouble with one goal in mind - to game the search engines in order to bring in more organic traffic.
For most web sites, having a dedicated unique IP address will have little to no effect on search engine rankings. Matt Cutts, the head of Google's Webspam team, stated: "If you are an average webmaster and just running a few sites, I wouldn't worry about them being on the same IP address and I definitely wouldn't worry about them being on the same server. That's something that everybody does."
To avoid any of the potential problems related with IP address sharing, it is best to acquire a unique IP address for your web site. Contact your web host and tell them you would like your own unique IP address. Be sure to let them know you would like a fresh IP address, not a recycled one. Web hosts will often reuse IP addresses that spammers have previously blacklisted. You may need to speak with several individuals until you can find a technician who can understand your request. Acquiring a unique IP address for your web site can cost anywhere from $25 to $100 for an initial setup fee, and $2 to $25 per month thereafter.